" Adds Harvard School of Public Health epidemiologist Walter Willett: "It is hard to put a finger on a specific food that prevents cancer in general.

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"These findings provide the first proof in man that aspirin prevents distant cancer metastasis, " the second study's authors concluded.

WSJ: Studies Find New Evidence Aspirin May Prevent Cancer

The full data from both of those studies will be presented at ASCO, as will another study showing that the company's Herceptin prevents breast cancer tumors with certain genetic defects from returning after surgery.

FORBES: This Year's Cancer Debutantes

But the results being released today, which will be presented tomorrow at the annual meeting of the Infectious Disease Society of America, show that it also prevents the cancer, at least in the short term.

FORBES: Key Merck Vaccine Prevents Cancer

The study from which the newly released data was taken, APPROVE, was designed to test whether Vioxx prevents the formation of colon polyps that can lead to cancer.

FORBES: More Murk For Merck